scholarly journals ADSORPTION OF STRONTIUM IONS FROM WASTEWATER BY SAUDI ACTIVATED BENTONITE

2020 ◽  
Author(s):  
SAAD SAID AL-SHAHRANI
Keyword(s):  
Activated Bentonite ◽  
Strontium Ions

Application of Activated Bentonite Impregnated with PdO as Green Catalyst for Acylation Reaction of Aromatic Compounds

2021 ◽  
pp. 105508
Author(s):  
Yehezkiel Steven Kurniawan ◽  
Arif Cahyo Imawan ◽  
Yoeretisa Miggia Stansyah ◽  
Tutik Dwi Wahyuningsih
Keyword(s):  
Aromatic Compounds ◽  
Acylation Reaction ◽  
Green Catalyst ◽  
Activated Bentonite

Separation of strontium ions from a simulated highly active liquid waste using a composite of silica-crown ether in a polymer

2008 ◽  
Vol 31 (18) ◽  
pp. 3148-3155 ◽  
Author(s):  
Anyun Zhang ◽  
Weihong Wang ◽  
Zhifang Chai ◽  
Mikio Kumagai
Keyword(s):  
Crown Ether ◽  
Liquid Waste ◽  
Highly Active ◽  
Active Liquid ◽  
Strontium Ions

Formation of dimethyl acetals of d-glucose, d-xylose, and l-idose in the presence of strontium ions

1975 ◽  
Vol 45 (1) ◽  
pp. 73-83 ◽  
Author(s):  
Frederick W. Parrish ◽  
Stephen J. Angyal ◽  
Michael E. Evans ◽  
John A. Mills
Keyword(s):  
Strontium Ions

scholarly journals Maximum Bleaching of Vegetable Oils by Acid-Activated Bentonite: Influence of Nanopore Radius

2012 ◽  
Vol 30 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Müsęerref Önal ◽  
Yüksel Sarıkaya
Keyword(s):  
Vegetable Oils ◽  
Bleaching Earth ◽  
Nitrogen Adsorption ◽  
Mass Range ◽  
Acid Mixture ◽  
Acid Activation ◽  
Physicochemical Interaction ◽  
Activated Bentonite ◽  
The Mean ◽  
Bleaching Power

The optimum conditions necessary for preparing a bleaching earth (BE) with maximum bleaching power (BP) towards soybean oil (SO) and cottonseed oil (CSO) were investigated. BEs were obtained by H2SO4 activation of a white calcium bentonite (CaB) sample from the Kütahya region of Turkey. After drying for 4 h at 105 °C, the CaB samples were activated by heating their acidic aqueous suspensions for 6 h at 97 °C, the acid content of the dry bentonite/acid mixture being varied in the 0–70% mass range. The respective specific surface area (S) and specific nanopore volume (V) of the BEs were determined from nitrogen adsorption/desorption data obtained at −196 °C. For natural CaB, the values of S and V were 44 m2/g and 0.11 cm3/g, respectively. These values attained a maximum of 135 m2/g and 0.30 cm3/g for the BE sample prepared employing 40% H2SO4 for acid activation. Interestingly, the maximum BP was not associated with the maximum S and V values. The optimum values for the percentage H2SO4, S and V for attaining the maximum BP were 20%, 100 m2/g and 0.17 cm3/g, respectively. The mean nanopore radius (r) of each BE was calculated using the corresponding S and V values. Nanopores with a mean radius in the range 3.5–5.5 nm, which was close to the diameter of the coloured pigment, were found to be mostly responsible for the BP towards SO and CSO. The results obtained in the present study indicate that the value of r was more effective than the S and V values of BEs in the bleaching of vegetable oils. Adsorption of a pigment onto a BE was found to depend not only on the physicochemical interaction between the pigment molecule and the BE surface, but also on the mean nanopore size.

Amorphous oxides of manganese as new sorbents of strontium ions

2007 ◽  
Vol 23 (1) ◽  
pp. 87-91 ◽  
Author(s):  
T.A. Marsagishvili ◽  
S.A. Kirillov ◽  
V.A. Chagelishvili ◽  
N.SH. Ananiashvili ◽  
D.I. Dzanashvili ◽  
...  
Keyword(s):  
Amorphous Oxides ◽  
Strontium Ions

Effect of Environmental Materials on Aqueous Corrosion of R7T7 Glass

1988 ◽  
Vol 127 ◽  
Author(s):  
N. Godon ◽  
E. Vernaz ◽  
J. H. Thomassin ◽  
J. C. Touray
Keyword(s):  
Atmospheric Pressure ◽  
Test Results ◽  
Aqueous Corrosion ◽  
Environmental Material ◽  
Environmental Materials ◽  
Activated Bentonite ◽  
Order Of Magnitude ◽  
Glass Specimen ◽  
Icp Analysis ◽  
Glass Behavior

ABSTRACTR7T7 glass behavior was investigated in contact with eleven different materials including smectites, bentonites, illites, granite and sand. The experiments were conducted at 90°C under atmospheric pressure with a 4 cm−1 SA/V ratio using two grams of material in double distilled water under static leaching conditions without renewal of the leachate. For each material a control test was conducted under the same conditions but without the glass specimen, as well as a series of tests on glass alone, without the environmental material. Kinetics studies lasting up to 364 days were performed on four selected materials.The test results (mass loss, ICP analysis of the leachates, SEM and TEM observations) showed relatively slight glass alteration in contact with sand, granite and one bentonite (i.e. the same order of magnitude as glass alone in deionized water), but greater alteration of glass in contact with all the other clays.The significant differences in glass behavior in contact with environmental materials can be accounted for by the behavior of the latter in solution: activated bentonite releases very large amounts of silicon and sodium into solution while smectite seems to remove silicon from solution.

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